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350 gph, for up to 75 gallon tank. Maintain a crystal clear, healthy aquarium. Three-stage filtration system with mechanical, chemical, and biological filtration in one reliable, easy to maintain unit. BIO-Wheel for superior biological filtration. Marineland For the Life of Your Fish. New Penguin 350 BIO-Wheel Power Filter. BIO-Wheel does it better. Effective biological filtration is the key to a healthy aquarium. Marineland's patented BIO-Wheel is the undisputed best biological filter. It's the ideal culture site for the growth of BIO-Spira - the beneficial bacteria responsible for biological filtration. Eliminates toxic ammonia and nitrite on contact. No pumps, valves or tubing required. Never clogs, never needs any replacing. Since its discovery and introduction by Marineland Labs, the patented BIO-Wheel has become the most widely used method for atmospheric filtration. At Marineland Labs, our expert team of scientists and technicians perform basic and applied aquatic research examining the chemical, biological aquatic research examining the chemical, biological and microbiological process which occurs in tropical fish aquara - freshwater and marine aquarium filter 350